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.. _split_fasta_on_sample_ids:
.. index:: split_fasta_on_sample_ids.py
*split_fasta_on_sample_ids.py* -- Split a single post-split_libraries.py fasta file into per-sample fasta files.
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**Description:**
Split a single post-`split_libraries.py <./split_libraries.html>`_ fasta file into per-sample fasta files. This script requires that the sequences identitifers are in post-`split_libraries.py <./split_libraries.html>`_ format (i.e., SampleID_SeqID). A fasta file will be created for each unique SampleID.
**Usage:** :file:`split_fasta_on_sample_ids.py [options]`
**Input Arguments:**
.. note::
**[REQUIRED]**
-i, `-`-input_fasta_fp
The input fasta file to split
-o, `-`-output_dir
The output directory [default: None]
**[OPTIONAL]**
`-`-buffer_size
The number of sequences to read into memory before writing to file (you usually won't need to change this) [default: 500]
**Output:**
Split seqs.fna into one fasta file per sample and store the resulting fasta files in 'out'
::
split_fasta_on_sample_ids.py -i seqs.fna -o out/
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